THERMODYNAMIC EVALUATION OF THE OXIDE SYSTEMS STABILITY AS APPLIED TO THE MATERIALS OF THE OXYGEN CONTROL SENSOR IN SODIUM

O. Lavrova, R. Askhadullin, A. Legkikh
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Abstract

The oxygen content in liquid sodium is an important normalized parameter that must be controlled during the operation of reactor fasilities with a sodium coolant. When developing a means of monitoring oxygen in liquid sodium, a careful selection of materials from which the sensitive elements of the control device (sensor) will be made is necessary. The criteria for selecting the sensor material include: acceptable corrosion resistance in liquid sodium under operating conditions; sufficient conductivity of oxygen ions at operating temperatures to generate a useful signal; and satisfactory resistance to thermal shock. Thermodynamic analysis allows to select materials that are potentially corrosion resistant to sodium in the sensitive element of the oxygen control sensor. The article presents a thermodynamic analysis of some metal oxide systems in contact with the sodium heat carrier of a sealed non-isothermal circulation circuit and an analysis of the stability of oxide systems in liquid sodium, which are the basis of ceramic sensing elements. It is shown that under certain conditions, deoxidized sodium can partially reduce the oxides of ceramics based on zirconium and hafnium with the addition of oxides of certain lanthanides. In addition, sodium reduces silicon oxide, on the basis of which sitall is produced, which is a candidate material for sealing the sensor sensor element. The analysis is performed using diagrams in the “electromotive force - temperature” coordinates constructed from thermodynamic data.
应用于钠氧控制传感器材料的氧化物体系稳定性的热力学评价
在使用钠冷却剂的反应堆设施运行过程中,液态钠中的氧含量是一个重要的归一化参数,必须加以控制。当开发一种监测液态钠中的氧的方法时,必须仔细选择制造控制装置(传感器)的敏感元件的材料。选择传感器材料的标准包括:在工作条件下可接受的耐液钠腐蚀性能;氧离子在工作温度下有足够的导电性以产生有用的信号;具有良好的抗热震性能。热力学分析允许在氧控制传感器的敏感元件中选择对钠具有潜在耐腐蚀性的材料。本文对密封非等温循环回路中与钠热载体接触的金属氧化物体系进行了热力学分析,并对氧化物体系在液态钠中的稳定性进行了分析,这是陶瓷传感元件的基础。结果表明,在一定条件下,加入某些镧系元素的氧化物,脱氧钠可以部分还原锆和铪基陶瓷的氧化物。此外,钠还原氧化硅,在此基础上产生sitall,这是密封传感器传感器元件的候选材料。利用热力学数据构建的“电动势-温度”坐标图进行分析。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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